If you train hard, your nutrition matters just as much as your intervals and long sessions. You can’t out-train a poor fuelling strategy. For endurance athletes, nutrition isn’t about restriction — it’s about giving your body the right fuel at the right time to perform, adapt, and recover.

This guide breaks down how to eat and fuel smartly — in training, racing, and everyday life — without overcomplicating it.

The Big Picture: Energy & Balance

Your body runs on three key fuels:

• Carbohydrate — high-octane fuel for endurance work.
• Fat — supports steady endurance and recovery.
• Protein — your repair kit for muscles and tissues.

The goal isn’t low-carb or high-protein — it’s balance. Enough carbs to train well, enough protein to recover, and enough total calories to adapt. Chronically under-fuelling leads to fatigue and stalled progress.

Fuel for the Work Required

Your nutrition should flex with your training load.

• Lighter/rest days: moderate carbs; prioritise protein, veg/fruit, hydration.
• Big training days: increase carbs before and after (rice, oats, potatoes, pasta, fruit, bread).
• Protein target: aim for 20–25 g at each meal and post-session.

Think in a 24-hour window — consistent fuelling keeps glycogen topped up and recovery on track.

Carbohydrate, Intensity & Timing

Match your fuel to the session:

• Easy/aerobic sessions: light fuelling (small snack/coffee before), then refuel after.
• Hard intervals or long rides/runs: full fuelling — carbs before, during, and after.

When glycogen runs low, power and pace dip. Don’t “train hungry” all the time — that’s a limiter, not a badge of honour.

Simple rule: if it’s meant to be easy, go light; if it’s meant to be hard, fuel it.

Training the Gut

Your gut adapts just like muscles. If you never practise fuelling, race day will be a gamble.

• Start around 40–50 g carbs/hour, build toward 60–90 g/hour for long/hard work. There’s talk of pros taking 120+ g/hour — remember they’re also producing far more power to sustain their speeds. More power/pace requires more fuel.
• Use mixed carb sources (roughly glucose + fructose ≈ 1:0.8); most modern gels/drinks already balance this.
• Test combinations in training; never try new fuel on race day.

A trained gut keeps absorbing late in a race — a huge advantage.

Race-Day Fuelling

Before

High-carb meal 3–4 hours pre-start (oats, toast, rice). Sip electrolyte drink up to the gun; consider a gel or chews/sweets ~20 minutes prior.

During

• 60–90 g carbs/hour via gels/chews/drinks.
• Include electrolytes; adjust fluid to heat/effort. As an absolute minimum ~500 ml/hour; in hot conditions many athletes require well over 1 L/hour.

After

Immediately start rehydrating. Then carbs + protein within 30–60 minutes (shake, sandwich, or full meal soon after).

Hydration & Electrolytes

Hydration = fluid + electrolytes (mainly sodium). General targets:

• 500–1000 ml fluid/hour depending on heat/intensity.
• ~500–1000 mg sodium/hour (sweat-rate dependent).

Weigh before/after long sessions. >2% body-mass loss = under-hydrated. Aim to finish hydrated, not sloshing.

Recovery Done Right

Recovery starts the moment the session ends. Use the 3 R’s:

• Refuel: ~1 g carbs/kg within the first hour.
• Repair: 20–25 g protein.
• Rehydrate: water or electrolytes back to baseline.

Real food works brilliantly. Add fruit/veg for antioxidants; no need to over-supplement.

Common Mistakes

• Under-fuelling easy days and feeling flat all week.
• Skipping recovery nutrition after key sessions.
• Ignoring hydration until thirst kicks in.
• Trying new products on race day.

Nail the basics first — 90% of performance nutrition is routine, not rocket science.

Supplements: Minimal but Useful

No supplement replaces good nutrition, but a few can help when the base diet is solid:

• Vitamin D (winter/low sun exposure).
• Iron if clinically low (test first).
• Caffeine for performance — trial in training.
• Electrolytes for long/hot sessions.

Putting It All Together

Endurance performance rests on three pillars: consistent training, adequate recovery, and smart fuelling.

• Fuel the work required.
• Match carbs to intensity.
• Train the gut.
• Hydrate intelligently.
• Recover deliberately.

Get these right and you don’t just race better — you train better, stay healthier, and arrive confident.

Coach Cronk — Enduraprep